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[POWERPC] Fix -Os kernel builds with newer gcc versions

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GCC 4.4.x looks to be adding support for generating out-of-line register
saves/restores based on:

http://gcc.gnu.org/ml/gcc-patches/2008-04/msg01678.html

This breaks the kernel if we enable CONFIG_CC_OPTIMIZE_FOR_SIZE.  To fix
this we add the use the save/restore code from gcc and simplified it down
for our needs (integer only).

Additionally, we have to link this code into each module.  The other
solution was to add EXPORT_SYMBOL() which meant going through the
trampoline which seemed nonsensical for these out-of-line routines.

Finally, we add some checks to prom_init_check.sh to ignore the
out-of-line save/restore functions.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Kumar Gala 2008-06-13 07:20:58 +10:00 committed by Paul Mackerras
parent 143580ecfb
commit da3de6df33
4 changed files with 246 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/Makefile
View File

@ -96,6 +96,8 @@ endif
else
KBUILD_CFLAGS += $(call cc-option,-mtune=power4)
endif
else
LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
endif
ifeq ($(CONFIG_TUNE_CELL),y)

14
arch/powerpc/kernel/prom_init_check.sh
View File

@ -48,6 +48,20 @@ do
fi
done
# ignore register save/restore funcitons
if [ "${UNDEF:0:9}" = "_restgpr_" ]; then
OK=1
fi
if [ "${UNDEF:0:11}" = "_rest32gpr_" ]; then
OK=1
fi
if [ "${UNDEF:0:9}" = "_savegpr_" ]; then
OK=1
fi
if [ "${UNDEF:0:11}" = "_save32gpr_" ]; then
OK=1
fi
if [ $OK -eq 0 ]; then
ERROR=1
echo "Error: External symbol '$UNDEF' referenced" \

2
arch/powerpc/lib/Makefile
View File

@ -9,7 +9,7 @@ endif
ifeq ($(CONFIG_PPC_MERGE),y)
obj-y := string.o alloc.o \
checksum_$(CONFIG_WORD_SIZE).o
obj-$(CONFIG_PPC32) += div64.o copy_32.o
obj-$(CONFIG_PPC32) += div64.o copy_32.o crtsavres.o
obj-$(CONFIG_HAS_IOMEM) += devres.o
endif

229
arch/powerpc/lib/crtsavres.S Normal file
View File

@ -0,0 +1,229 @@
/*
* Special support for eabi and SVR4
*
* Copyright (C) 1995, 1996, 1998, 2000, 2001 Free Software Foundation, Inc.
* Copyright 2008 Freescale Semiconductor, Inc.
* Written By Michael Meissner
*
* Based on gcc/config/rs6000/crtsavres.asm from gcc
*
* This file is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* In addition to the permissions in the GNU General Public License, the
* Free Software Foundation gives you unlimited permission to link the
* compiled version of this file with other programs, and to distribute
* those programs without any restriction coming from the use of this
* file. (The General Public License restrictions do apply in other
* respects; for example, they cover modification of the file, and
* distribution when not linked into another program.)
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* As a special exception, if you link this library with files
* compiled with GCC to produce an executable, this does not cause
* the resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*/
#include <asm/ppc_asm.h>
.file "crtsavres.S"
.section ".text"
#ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
/* Routines for saving integer registers, called by the compiler. */
/* Called with r11 pointing to the stack header word of the caller of the */
/* function, just beyond the end of the integer save area. */
_GLOBAL(_savegpr_14)
_GLOBAL(_save32gpr_14)
stw 14,-72(11) /* save gp registers */
_GLOBAL(_savegpr_15)
_GLOBAL(_save32gpr_15)
stw 15,-68(11)
_GLOBAL(_savegpr_16)
_GLOBAL(_save32gpr_16)
stw 16,-64(11)
_GLOBAL(_savegpr_17)
_GLOBAL(_save32gpr_17)
stw 17,-60(11)
_GLOBAL(_savegpr_18)
_GLOBAL(_save32gpr_18)
stw 18,-56(11)
_GLOBAL(_savegpr_19)
_GLOBAL(_save32gpr_19)
stw 19,-52(11)
_GLOBAL(_savegpr_20)
_GLOBAL(_save32gpr_20)
stw 20,-48(11)
_GLOBAL(_savegpr_21)
_GLOBAL(_save32gpr_21)
stw 21,-44(11)
_GLOBAL(_savegpr_22)
_GLOBAL(_save32gpr_22)
stw 22,-40(11)
_GLOBAL(_savegpr_23)
_GLOBAL(_save32gpr_23)
stw 23,-36(11)
_GLOBAL(_savegpr_24)
_GLOBAL(_save32gpr_24)
stw 24,-32(11)
_GLOBAL(_savegpr_25)
_GLOBAL(_save32gpr_25)
stw 25,-28(11)
_GLOBAL(_savegpr_26)
_GLOBAL(_save32gpr_26)
stw 26,-24(11)
_GLOBAL(_savegpr_27)
_GLOBAL(_save32gpr_27)
stw 27,-20(11)
_GLOBAL(_savegpr_28)
_GLOBAL(_save32gpr_28)
stw 28,-16(11)
_GLOBAL(_savegpr_29)
_GLOBAL(_save32gpr_29)
stw 29,-12(11)
_GLOBAL(_savegpr_30)
_GLOBAL(_save32gpr_30)
stw 30,-8(11)
_GLOBAL(_savegpr_31)
_GLOBAL(_save32gpr_31)
stw 31,-4(11)
blr
/* Routines for restoring integer registers, called by the compiler. */
/* Called with r11 pointing to the stack header word of the caller of the */
/* function, just beyond the end of the integer restore area. */
_GLOBAL(_restgpr_14)
_GLOBAL(_rest32gpr_14)
lwz 14,-72(11) /* restore gp registers */
_GLOBAL(_restgpr_15)
_GLOBAL(_rest32gpr_15)
lwz 15,-68(11)
_GLOBAL(_restgpr_16)
_GLOBAL(_rest32gpr_16)
lwz 16,-64(11)
_GLOBAL(_restgpr_17)
_GLOBAL(_rest32gpr_17)
lwz 17,-60(11)
_GLOBAL(_restgpr_18)
_GLOBAL(_rest32gpr_18)
lwz 18,-56(11)
_GLOBAL(_restgpr_19)
_GLOBAL(_rest32gpr_19)
lwz 19,-52(11)
_GLOBAL(_restgpr_20)
_GLOBAL(_rest32gpr_20)
lwz 20,-48(11)
_GLOBAL(_restgpr_21)
_GLOBAL(_rest32gpr_21)
lwz 21,-44(11)
_GLOBAL(_restgpr_22)
_GLOBAL(_rest32gpr_22)
lwz 22,-40(11)
_GLOBAL(_restgpr_23)
_GLOBAL(_rest32gpr_23)
lwz 23,-36(11)
_GLOBAL(_restgpr_24)
_GLOBAL(_rest32gpr_24)
lwz 24,-32(11)
_GLOBAL(_restgpr_25)
_GLOBAL(_rest32gpr_25)
lwz 25,-28(11)
_GLOBAL(_restgpr_26)
_GLOBAL(_rest32gpr_26)
lwz 26,-24(11)
_GLOBAL(_restgpr_27)
_GLOBAL(_rest32gpr_27)
lwz 27,-20(11)
_GLOBAL(_restgpr_28)
_GLOBAL(_rest32gpr_28)
lwz 28,-16(11)
_GLOBAL(_restgpr_29)
_GLOBAL(_rest32gpr_29)
lwz 29,-12(11)
_GLOBAL(_restgpr_30)
_GLOBAL(_rest32gpr_30)
lwz 30,-8(11)
_GLOBAL(_restgpr_31)
_GLOBAL(_rest32gpr_31)
lwz 31,-4(11)
blr
/* Routines for restoring integer registers, called by the compiler. */
/* Called with r11 pointing to the stack header word of the caller of the */
/* function, just beyond the end of the integer restore area. */
_GLOBAL(_restgpr_14_x)
_GLOBAL(_rest32gpr_14_x)
lwz 14,-72(11) /* restore gp registers */
_GLOBAL(_restgpr_15_x)
_GLOBAL(_rest32gpr_15_x)
lwz 15,-68(11)
_GLOBAL(_restgpr_16_x)
_GLOBAL(_rest32gpr_16_x)
lwz 16,-64(11)
_GLOBAL(_restgpr_17_x)
_GLOBAL(_rest32gpr_17_x)
lwz 17,-60(11)
_GLOBAL(_restgpr_18_x)
_GLOBAL(_rest32gpr_18_x)
lwz 18,-56(11)
_GLOBAL(_restgpr_19_x)
_GLOBAL(_rest32gpr_19_x)
lwz 19,-52(11)
_GLOBAL(_restgpr_20_x)
_GLOBAL(_rest32gpr_20_x)
lwz 20,-48(11)
_GLOBAL(_restgpr_21_x)
_GLOBAL(_rest32gpr_21_x)
lwz 21,-44(11)
_GLOBAL(_restgpr_22_x)
_GLOBAL(_rest32gpr_22_x)
lwz 22,-40(11)
_GLOBAL(_restgpr_23_x)
_GLOBAL(_rest32gpr_23_x)
lwz 23,-36(11)
_GLOBAL(_restgpr_24_x)
_GLOBAL(_rest32gpr_24_x)
lwz 24,-32(11)
_GLOBAL(_restgpr_25_x)
_GLOBAL(_rest32gpr_25_x)
lwz 25,-28(11)
_GLOBAL(_restgpr_26_x)
_GLOBAL(_rest32gpr_26_x)
lwz 26,-24(11)
_GLOBAL(_restgpr_27_x)
_GLOBAL(_rest32gpr_27_x)
lwz 27,-20(11)
_GLOBAL(_restgpr_28_x)
_GLOBAL(_rest32gpr_28_x)
lwz 28,-16(11)
_GLOBAL(_restgpr_29_x)
_GLOBAL(_rest32gpr_29_x)
lwz 29,-12(11)
_GLOBAL(_restgpr_30_x)
_GLOBAL(_rest32gpr_30_x)
lwz 30,-8(11)
_GLOBAL(_restgpr_31_x)
_GLOBAL(_rest32gpr_31_x)
lwz 0,4(11)
lwz 31,-4(11)
mtlr 0
mr 1,11
blr
#endif